Preparation of Crystallized Ba-Rich Ba1-XCaXWO4 Solid-Solution Films by an Electrochemical Method at Room Temperature and Their Luminescence

Abstract
Well crystallized solid-solution Ba1- X Ca X WO4 films have been prepared on tungsten substrates in an electrolytic solution containing Ba2+ and Ca2+ ions by an electrochemical method at room temperature (25° C). CaWO4 film showed only blue emission at liquid nitrogen temperature (-196° C), strongly suggesting that it consisted of well crystallized defect-free crystals. However, the other films did not luminesce at this temperature.